Lennox 80K27 Pressure Switch

The Lennox 80K27 Pressure Switch is a critical safety and operational component designed for high-performance Lennox HVAC systems. Engineered for precision, this furnace pressure switch features a 0.34" wc setpoint, ensuring the draft inducer motor is moving exhaust gases safely before the ignition sequence begins. The SPST (Single Pole Single Throw) configuration provides a reliable normally-open circuit that closes under proper pneumatic pressure, protecting the system from dangerous conditions caused by flue blockages or vent obstructions. With its standardized 1/4" barb connection, this OEM Lennox part offers a secure, leak-resistant interface with factory suction tubes, maintaining the pressure integrity required for modern high-efficiency and standard gas furnaces.

Key Benefits:

• Precise 0.34" WC Actuation: Calibrated specifically to trigger at calibrated water column levels for accurate airflow monitoring.
• OEM Compatibility: A direct 80K27 replacement part designed to meet original equipment manufacturer specifications for fit and function.
• Industrial-Grade Build: Constructed with a durable diaphragm to withstand the frequent cycling and environmental demands of commercial and residential furnaces.
• Secure Installation: The 1/4" barb connector allows for quick, tight-fitting integration with existing pressure switch hoses.

Common Questions:

How do I know if my furnace needs a new 80K27 pressure switch?
Common signs include the inducer motor running but the furnace failing to ignite, or receiving an LED fault code for "Pressure Switch Open." If the diaphragm is ruptured or the internal contacts have failed, the system will prevent ignition as a safety precaution.

Can I use this switch for different setpoints?
No. Pressure switches are calibrated for specific furnace requirements. Using a 0.34" wc switch in a system designed for a higher or lower rating can lead to improper combustion or safety lockouts.

What causes these switches to trip?
While the switch itself can fail, it often trips due to external issues like a clogged flue pipe, water in the suction hose, or a failing draft inducer motor that isn't creating enough vacuum.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.